Any tips for tracking down a vacuum leak on a '99 XJ 4.0L? The check engine light came on and the scan read "vacuum leak-bay 1". Is there a good way to find the leak, or just start searching? Thanks for any advice!

propane torch, unlit but opened...run the engine at idle, run the torch slowly across all suspect ares, and listen for the rpm to increase as the vacuum sucks the propane into the engine

I've heard of many people using brake cleaner, ether, etc. in a similar fashion, but I dont like the idea of sprying a flamable liquid on a hot engine, besdies the fact that it semms like it would be less accurite that way

does ur cruise control work? how about the heater controls do they switch from the vents to the floor i have noticed that they like to break a line under the batt at the cruise contol line.

I will check out the cruise control, been a bit since I tried it. The vents and everything work fine. The jeep runs fine while driving, but after idling a while runs rough. Also, if I stop at a red light, the tach dips down to about 500 rpm just as i come to the stop, and then levels out.